made bunch of changes to the way instructions and directives are described/handled in the assembler
Merge branch 'master' of https://github.com/theepot/esc64

Conflicts:
	assembler/include/esc64asm/tokendescr.h
	assembler/src/opcodetrans.c
	assembler/src/reswords.c
	assembler/src/tokendescr.c